Two equal point charges each of magnitude 2.00 x 10^-6 C are located on the x axis, one at x= 1.00m, the other at x= -1.00m.
a) Determine the electric field on the y axis at y= 0.500 m.
b) Calculate the electric force on a thirde charge Q= -3.00 x 10^-6 C placed at y= 0.500 m.